Hugo behrens



(No Model.) H. BEHRENS. BUILDING BLOCK AND APPARATUS FOR MANUFACTURING SAME. No. 522,143.

Patented June 26, 1894.

INVENTOR: 4 1 1450 Fair-m5 BY WITNESSES ATTORNEYS.

m: NATIONAL LITHOGRAPHING COMPANY.

NITED STATES PATENT Genres.

HUGO BEHRENS, OF BERLIN, GERMANY.

BUILDING-BLOCK AND APPARATUS FOR MANUFACTURING SAME.

SPECIFICATION forming part of Letters Patent No. 522,143, dated June 26, 1894. Application filed December I, 1893. Serial No. 492.485. (No model.)

T at whom it may concern:

Be it known that I, HUGO BEHRENS,aSl1b-' ect of the King of Prussia, residing at Berlin, in the Kingdom of Prussia and German Empire, have invented new and useful Improvements in Building-Blocks and Apparatus for Manufacturing the Same, of which the following is a specification.

This invention has for its object to provide a new and improved mold for making cement buildingblockswith openings which run in the direction of their length, and are separated from each other by narrow partitions, and openings which run transversely, or atright angles to the first mentioned openings and place the latter in communication with one another, the construction being such that the blocks can be quickly and conveniently removed from the mold without damage.-

To accomplish this object my invention consists in the features of construction and the combination or arrangement of parts herenafter described and claimed, reference belng made to the accompanying drawings, in which- Figure 1 is a plan view of a mold constructed in accordance with my invention. Fig. 2 is an end elevation of the same. Fig. 3 is a sectlonal view taken on the line w-m, Fig. 2. Fig. 4 1s a plan view of a mold, showing a modification of the invention. Fig. 5 is an end elevatlon of the same. Fig. 6 is a sectional view taken on the line 'yy Fig. 4, and Fig. 7 is a sectlonal view taken on the line zz Fig. 4:.

In order to enable those skilled in the art to make and use my invention, I will now describe the same in detail, referring to the drawings, where it will be observed that the frame of the mold is composed of two side bars a, and a, two end bars I) and b, and aseries of tubular'cores c, which'may be formed of sheet metal, and are supported at their end portions, as shown in Fig. 1, by the side bars a. The side and end barsare so connected that they can be readily and conveniently detached, and for this purpose the side-bars a are provided with dowels d which extend through corresponding openings in flanges Z on the extremities of the end bars I), and are locked by keys g passing through the dowels and bearing against the flanges. The cores c are tapering,or slightly conical, so that they can be readily withdrawn from the mold.

In practice the mold is filled with a cement mass which, before beingintroduced into the mold, should be suitably prepared of the proper consistency, so that it will readily set in the mold. The tapering or conical cores 0 roduce openin s which run len thwise of.

0 are drawn out, the keys 9 are removed, and

the side and end bars of the mold frame are carefully detached, leaving the building block upon the platform a.

In the modification illustrated in Figs. 4, 5, 6, and 7, the reference letters indicate the same parts as hereinbefore described with reference to Figs. 1, 2 and 3, but the cores 0 are supported by the end bars I), and the rod h passes through the cores, and is engaged with the side bars a, while the cores 0 are substantially rectilinear on their lower sides, and concave on their upper sides, so that the block produced will have longitudinal openings corresponding to the shape of the cores.

In the construction illustrated by Figs. 1,

'2,.and 3, the end bars b are provided with rectilinear projections f, which form corresponding recesses in the cement block.

In Figs. .4, 5, 6, and 7 the end bars are provided with projecting flanges t" and n at the top and bottom, and one of the side bars is provided with a recess or trough m, and the other side bar with an overhanging lip p, whereby the cement block is formed with recesses and lips corresponding to the shape of the side and end bars above mentioned.

The molds can be of any desired size to produce blocks of any desired dimensions, but the dimensions are preferably such that the blocks can be handled and joined together in the manner usually practiced with ordinary stone blocks, and when the blocks are assembled the longitudinal openings form tubular channels which are in communication with one another through the medium of the transverse channels formed by the removable rod.

Having thus described my invention, what I claim is 1. A mold for making cement building blocks, consisting of two side bars a, two end bars I) having their extremities detachably connected with the ends of the side bars, the hollow cores 0 removably arranged in the side bars, and a removable rod h extending transversely through the cores and end bars, substantially as described.

2. A mold for making cement building blocks, consisting of two side bars at having end dowels (Z, two end bars I) having end flanges Z engaging said dowels, keys 9 holding the flanges on the dowels, cores 0 supported by the side bars, and a removable rod h extending transversely through the cores and end bars, substantially as described.

bars I) having end flanges Z engaging said dowels, keys for holding the flanges on the dowels, and a series oftapering cores 0 removably mounted in two of said bars to form openings in the body of the molded block, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

HUGO BEIIRENS. Witnesses:

0. Ron. WALDER, CARL WENZEL. 

